Possible causes – Faulty spark plug 1– Clogged or faulty fuel injector 1– Faulty ignition coil 1– Fuel injector 1 harness is open or shorted– Fuel injector 1 circuit poor electrical connection– Ignition coil 1 harness is open or shorted–

Possible causes – Faulty spark plug 10– Clogged or faulty fuel injector 10– Faulty ignition coil 10– Fuel injector 10 harness is open or shorted– Fuel injector 10 circuit poor electrical connection– Ignition coil 10 harness is open or shorted–

Possible causes – Faulty spark plug 2– Clogged or faulty fuel injector 2– Faulty ignition coil 2– Fuel injector 2 harness is open or shorted– Fuel injector 2 circuit poor electrical connection– Ignition coil 2 harness is open or shorted–

Possible causes – Faulty spark plug 3– Clogged or faulty fuel injector 3– Faulty ignition coil 3– Fuel injector 3 harness is open or shorted– Fuel injector 3 circuit poor electrical connection– Ignition coil 3 harness is open or shorted–

Possible causes – Faulty spark plug 4– Clogged or faulty fuel injector 4– Faulty ignition coil 4– Fuel injector 4 harness is open or shorted– Fuel injector 4 circuit poor electrical connection– Ignition coil 4 harness is open or shorted–

Possible causes – Faulty spark plug 5– Clogged or faulty fuel injector 5– Faulty ignition coil 5– Fuel injector 5 harness is open or shorted– Fuel injector 5 circuit poor electrical connection– Ignition coil 5 harness is open or shorted–

Possible causes – Faulty spark plug 6– Clogged or faulty fuel injector 6– Faulty ignition coil 6– Fuel injector 6 harness is open or shorted– Fuel injector 6 circuit poor electrical connection– Ignition coil 6 harness is open or shorted–

Possible causes – Faulty spark plug 7– Clogged or faulty fuel injector 7– Faulty ignition coil 7– Fuel injector 7 harness is open or shorted– Fuel injector 7 circuit poor electrical connection– Ignition coil 7 harness is open or shorted–

Possible causes – Faulty spark plug 8– Clogged or faulty fuel injector 8– Faulty ignition coil 8– Fuel injector 8 harness is open or shorted– Fuel injector 8 circuit poor electrical connection– Ignition coil 8 harness is open or shorted–

Possible causes – Faulty spark plug 9– Clogged or faulty fuel injector 9– Faulty ignition coil 9– Fuel injector 9 harness is open or shorted– Fuel injector 9 circuit poor electrical connection– Ignition coil 9 harness is open or shorted–

Possible causes – Faulty Speed Sensor– Speed Sensor harness is open or shorted– Speed Sensor circuit poor electrical connection When is the code detected? Diagnostic trouble code is detected when Transmission Control Module (TCM) does not receive the proper voltage

Possible causes – Faulty Speed Sensor– Speed Sensor harness is open or shorted– Speed Sensor circuit poor electrical connection When is the code detected? The output shaft speed sensor failed to provide a signal to the TCM upon initial movement

Possible causes – Faulty Speed Sensor– Speed Sensor harness is open or shorted– Speed Sensor circuit poor electrical connection Symptoms – Engine Light ON (or Service Engine Soon Warning Light)– Speedometer improper reading– Possible shifting problems P0721 AUDI Description The

Possible causes – Faulty throttle position sensor.– Throttle position sensor harness is open or shorted– Throttle position sensor circuit poor electrical connection When is the code detected? An excessively low voltage from the Throttle Pedal Position (TPP) Sensor is sent

Possible causes – Faulty Throttle Position Sensor– Throttle Position Sensor circuit is open or shorted– Throttle Position Sensor poor electrical connection When is the code detected? Malfunction is detected when an excessively low or high voltage from the sensor is

Possible causes – Faulty throttle position sensor– Throttle position sensor harness is open or shorted– Throttle position sensor circuit poor electrical connection When is the code detected? An excessively high voltage from the Throttle Pedal Position (TPP) Sensor is sent

Possible causes – Faulty throttle position sensor– Throttle position sensor harness is open or shorted– Throttle position sensor circuit poor electrical connection– Faulty Engine Control Module (ECM) When is the code detected? Malfunction is detected when an excessively low or

Possible causes – Faulty torque converter clutch solenoid valve– Torque converter clutch solenoid valve harness is open or shorted– Torque converter clutch solenoid valve circuit poor electrical connection– Low transmission fluid level– Dirty transmission fluid Tech notes This is an

Possible causes – Faulty Transmission Fluid Temperature Sensor– Transmission Fluid Temperature Sensor harness is open or shorted– Transmission Fluid Temperature Sensor circuit poor electrical connection When is the code detected? Transmission Control Module (TCM) detects an intermittent voltage from the

Possible causes – Faulty Transmission Fluid Temperature Sensor– Transmission Fluid Temperature Sensor harness is open or shorted– Transmission Fluid Temperature Sensor circuit poor electrical connection When is the code detected? Transmission Control Module (TCM) detects excessively high voltage from the